Normal Operation

Safing sensor input - battery feed/return open circuit.

Normal Operation

The diagnostic module measures the voltage on diagnostic module pin 1-9 at all times. The voltage can be as high as 25 volts when the backup power supply is fully charged.

Pin 1-9 is connected to pin 2-11 inside the safing sensor and the voltage on both these pins should be the same. If the voltage on pin 2-11 falls below the voltage on pin 1-9, a code 23 is generated.

Possible Causes

• Open circuit in the wiring to diagnostic module pin 1-9.
• Open circuit in the wiring to diagnostic module pin 2-11.

Fault Analysis

WARNING: Read and adhere to all warnings and safety procedures at the start of this section when working on the airbag system.

1. Disarm the airbag system and fit airbag simulators (6.4.21.4).
2. Disconnect the diagnostic connector and the safing sensor connector. Check for continuity from DM pin 1-9 to safing sensor harness connector pin 7 and from DM pin 1-11 to safing sensor harness connector pin 6.

   If the continuity of both leads is good, go to step 3.

   If a continuity fault is detected, repair the wiring as necessary. Reconnect all components. Clear the code 23. Rearm the airbags (6.4.21.4).

3. Check the continuity between pins 6 and 7 of the safing sensor.

   If the continuity is good, replace the diagnostic module. Rearm the airbags (6.4.21.4).

   If a continuity fault is detected, replace the safing sensor. Reset the code 23. Rearm the airbags (6.4.21.4).